Fair Value Measurements (Details) (Recurring basis, USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Fair value
Non-pension financial assets and liabilities measured at fair value
Total assets	$ 0.6
Total liabilities	6.7	0.8
Fair value | Foreign currency options
Non-pension financial assets and liabilities measured at fair value
Total assets	0.1
Fair value | Option contracts
Non-pension financial assets and liabilities measured at fair value
Total assets	0.1
Fair value | Foreign currency forward contracts
Non-pension financial assets and liabilities measured at fair value
Total assets	0.4
Total liabilities	0.6	0.8
Fair value | Interest rate swap agreements
Non-pension financial assets and liabilities measured at fair value
Total liabilities	6.1
Quoted Prices in Active Markets for Similar Assets (Level 2)
Non-pension financial assets and liabilities measured at fair value
Total assets	0.6
Total liabilities	6.7	0.8
Quoted Prices in Active Markets for Similar Assets (Level 2) | Foreign currency options
Non-pension financial assets and liabilities measured at fair value
Total assets	0.1
Quoted Prices in Active Markets for Similar Assets (Level 2) | Option contracts
Non-pension financial assets and liabilities measured at fair value
Total assets	0.1
Quoted Prices in Active Markets for Similar Assets (Level 2) | Foreign currency forward contracts
Non-pension financial assets and liabilities measured at fair value
Total assets	0.4
Total liabilities	0.6	0.8
Quoted Prices in Active Markets for Similar Assets (Level 2) | Interest rate swap agreements
Non-pension financial assets and liabilities measured at fair value
Total liabilities	$ 6.1